Apache Reference: mod_status

mod_status - Display Summary of Server Runtime Information
Since Apache 1.1, src/modules/standard/mod_status.c
Mark Cox (1995)

mod_status provides a content handler that can be mapped to a URL and that outputs a runtime status page when requested. In particular internal process information is displayed. A variant can be displayed that gives a simple machine-readable list of the current server state. Always think about your privacy before using this module.

Directive:

ExtendedStatus